What are the societal risks associated with AI?
The biggest risk is algorithmic bias. As more and more decision-making processes are taken on by AI systems, there will be an abdication of responsibility to the computer; people in charge will simply claim the computer did it, and they cannot change it.

The real problem is that training data for machine learning often contains bias, which is usually ignored or not recognised. There was a story on BBC Radio about someone whose passport photo was rejected by an algorithm because he supposedly had his mouth open. However, he belonged to an ethnic group which has larger lips than Caucasian whites, but the machine could not cope with that.

There is a whole raft of examples where similar things happen: if you belong to a minority group, machine learning can lead to you being excluded, just because the algorithms will have been trained on training data that was too restricted.

Update: Here is a link to a BBC News story about the example I mentioned.